[TOP]perfidy per·fidy / ˈpə:fədi; <ɪ style="color:#62081f">ŋæmə <ʃOŋð color="#ˌdˌdˌd">ˈpə:rf- / noun əu] (literary) unfair treatment of sb who trusts you 背叛；背信弃义 SYN treachery[TOP]perfidy per·fi·dy / ˈpɚfədɪ ; ˈpɜ:fədi / noun [U] [literary] 1. when someone is not loyal to another person who trusts them 不忠，背信弃义; SYN treachery [TOP]perfidyUK ['pɜ:.fɪ.di] US ['pɝ:.fə-] literary noun uncountable » behaviour which is not loyal 背信弃义（行为）；不忠贞（行为） [TOP]perfidy
1.N-UNCOUNT 不可数名词 背信弃义；背叛；不忠；不仁不义Perfidy is the action of betraying someone or behaving very badly towards someone.